5.36
5.3.6 Repair of Control / Interface Unit
See Figure 6.1 for location of boards and assemblies. All boards in the card rack are removed by:
1. Removing the 4 x M6 socket head screws (5mm Allen Key) securing the front cover.
2. Loosening the two screws holding the PCB locking bar and sliding the bar to the right.
After replacing boards:
3. Slide the PCB locking bar left and tighten the two screws.
4. Close the front cover and tighten the four screws.
5.3.6.1 Repair / Replacement of Power Supply
1. Remove front cover on Control or Interface Unit.
2. Disconnect heater and mains supply from terminal block TB-A on front of power supply.
3. Disconnect 26-0-26 VAC from 4-20mA board (01100929, 929A or 939) and 10-0-10 VAC
from data communications board (01100927) if fitted.
4. Undo earth (ground) connection at left hand side of case and remove earth wire.
5. Unscrew and remove screws (20) holding power supply to case. See figure 6.1.
6. Pull power supply forward enough to enable access to terminal block TB-B and
disconnect.
7. Remove power supply from case.
Remove power supply board (01100919) as follows:
Refer to figure 5.6.
8. Unsolder ten wires down edge of board and cut cable tie.
9. Unscrew and remove Supadriv screws holding heatsink on the end of the power supply.
Lift heatsink out of the way.
10. Unscrew and remove the slot head screws holding the board (7).
11. If required the solid state relay can now be de-soldered from the printed circuit board.
12. Reassembly is the reverse of this process. See Figure 5.6 for electrical connections.
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